2. Episode 2

Alliances are formed in a test of endurance and memory.

3. Episode 3

Model and reality star Arabella Chi faces a dilemma: will she stay loyal to an old friend?

4. Episode 4

One player questions if her friendship is worth risking £50,000 for?

5. Episode 5

Host Mark Wright presides over the Final, as the remaining Challengers race across the Argentinian countryside for their share of £100,000, and to be crowned Challenge UK Champion.